Mckinny



(No Model.)

G. W. MGKINNY.

BAREv FEBDING MEGHANISM POR BARB WIRE MMHINES.4 l No. 397,925. Patented Peb. 19, 1889.

@9m UNH UNITED STATES PATENT OEEICE.

GEORGE WASHINGTON MCKINNY, OF MARSHALLTOVN, IOVA.

BARB-FEEDING MECHANISM FOR BARE-WIRE MACHINES.

SPECIFICATION forming part of Letters Patent No. 397,925, dated February 19, 1889.

l Application tiled September 19, 1887. Serial No. 250,059. (No model.)

Barb-Wire Machines, of which the following is a specification.

The object of my invention is to provide a 1 feed mechanism or attachment for barb-wire machines by which the barb-wire is not only fed through the machine to the barb forming or twisting devices, but by which a peculiar shape is given to the barb-wire.

One form of my invention is shown in the accompanying drawings, in which Figure lis a side elevation. Fig. 2 is an end View. Fig. 3 is a perspective and shows the finished product at O and P in the form of a two-pointed barb wrapped once around the main or strand wire.

Same letters indicate similar parts in the different figures.

A is the frame.

B is the lower feed-roll, mounted on the shaft h, turning in bearings in the frame A.

This roll has a groove, d, running round its periphery, which is deep enough to admit half the thickness of the wire to be operated upon.

O is the upper feed-roll, mounted on shaft o, which is hung on what may be termed swinging bearings, as they are free to be raised or fall as occasion requires. The forward bearing, R, is supported by the pin g in frame A, and the rear bearing, F, by the pin g in the upright E, which pin acts as a hinge for said bearing F. l

The periphery of the roll C is cut up into alternate projections and depressions to correspond to the peculiar shape desired for the barb-wire. It is obvious that when in the turning of the feed-rolls a projection of roll O comes against the barb-wire it flattens or depresses the same, as shown at e e, and when a depression of roll C passes over the wire it is left round and unflattened, as shown at f f. The position of the feed-rolls may be reversed, if desired, O being placed below and B above.

Motion is communicated from the lower shaft, b, to the upper shaftc, by the gears D D, keyed one to each shaft, as shown. Intermittent motion is given to these shafts from themain portion of the machine (not shown) in any usual and convenient way. All barbwire machines, so far as I know, operate their feed attachments intermittently-that is, the feed stops while the barb is being made and twisted-and hence it has not seemed necessary to show any means of giving this intermittent motion, as many ways of doing so will readily suggest themselves to any one familiar with barb-wire machines, the construction of my improved feedingattachment being such that it can be inserted in and operated by any of the usual barb-wire machines, among which, for the sake of clearness, may be mentioned that described in Letters Patent No. 345,759, dated July 20, 1886, to Albert J. Bates. In using that machine my barb-feeding mechanism would be put in place of his barb-feeding mechanism, the rest of the machine remaining the same.

Just before reaching the rolls the barb-wire passes through the bracket N on frame A, so.

that it may be held up on a level with the feed-line and not have atendency to sag upon the lower roll. When the wire reaches the barb-forming mechanism, the proper length is cut off and the barb formed, as usual in such machines.

The eccentric-lever G, which is rigidly 'attached to the front bearing, R, is operated to Acontrol the pressure of the upper feed-roll, C,

upon the lower roll, B, in a very simple way by the cam H, as follows: The cam is mounted on a small pin projecting from the frame A, the larger or operative part of the cam being away from the shaft b when the handle is downward, as shown in the drawings. This is its normal position, and the upper feedroll then presses upon the lower by its own unsupported weight and that of the shaft c and the bearings for the same and the gear carried thereon, the same being increased, if necessary, by pressure from the screw I. Vhen it is desired to raise the pressure of roll C from contact with the lower roll, B, the handle of the cam II is turned up, the limit of its motion being when it strikes the bearing of IOO the shaft C, by which time the larger or active portion of the cam is toward the shaft Y), having pushed the lever G 'in toward said shaft and raised the upper roll, C, and shaft c, the weight of which is now supported bythe cani Il, which is held against the lever G hy the spring G', rigidly fastened at its upper end to lever G. Gbviously any intermediate position of the cani will give a corresponding closeness or looseness to the contact between the feed-rolls.

One method oi transmitting the intermitient .motion above referred to from the main portieri of the machine is illustrated in Fig. 4:, y

being` acommon pawland-ratchet motion, in i which the ratchet li is rigidi)r fastened on lower shaft, I), and the pawl, J, which moves said ratcllet, is hung by a pin on the bracket S', which projects from a loose sleeve, S, on*` The paw] held np to its work by shaft Z).

the sprin L, held in the split pin M on said bracket, and said bracket and sleeve are alternately raised and lowered by an eccentric-rml (not shown, but operating in, the way usual of eccentric-rods) pinned to said bracket, and also to some convenient revolving shaft in the main portion of the machine, the distance ot' said pin from the center ot said shaft of course dependingl upon the amount ol' throw necessary for the pawl J.

All of the aboVe-descril )ed mechanism ex cept the feed-rolls is well known and of usual constructiom and I therefore make no claim except to the said ii'eed-rolls.

I claim- A barb-'feed mechanism, ifor barb-wire n1achines, which consists of feed-rolls, one of which is grooved to receive the barb-wire and the other. of which is provided with abroken periphery, which lorces lhe wire during,` the process ol? feeding` into the shape desired for 1 formingl the barb, and mechanism for operating' the same, substantially as described, and for the purposes specified.

GEORGE WASHINGTON McKl'NNY. "Witnesses:

RICHARD K. llriennnosn, J. M. PARKER. 

